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Docker Container/Service with Same Port: Best Practices? (lemmy.dbzer0.com)

submitted 1 year ago by EliteCow@lemmy.dbzer0.com to c/selfhosted@lemmy.world

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I am very new to using docker. I have been used to using dedicated VM's and hosting the applications within the servers OS.

When hosting multiple applications/services that require the same port, is it best practice to spin up a whole new docker server or how should I go about the conflicts?

Ie. Hosting multiple web applications that utilize 443.

Thank you!

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[–] herrfrutti@lemmy.world 5 points 1 year ago

Caddy would have the bridge proxy network and the port 443 exposed.

version: "3.7"

networks:
  proxy-network:
    external: true
# needs to be created manually bevor running (docker create network proxy-network)
services:
  caddy:
    image: caddy
    container_name: caddy
    restart: unless-stopped
    ports:
      - 80:80
      - 443:443
    volumes:
      - ./data:/data
      - ./config:/config
      - ./Caddyfile:/etc/caddy/Caddyfile:ro
    networks:
      - proxy-network

Other services:

version: "3.7"

networks:
  proxy-network:
    external: true

services:
  app:
    image: app
    container_name: app
    restart: unless-stopped
    volumes:
      - ./app-data:/data
    networks:
      - proxy-network

Caddy can now talk to the app with the apps container_name.

Caddyfile:

homepage.domain.de {
    reverse_proxy app:80
}

So the reverse proxy network is an extra network only for containers that need to be exposed.